<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
   <style>
        * {
        margin: 0;
        padding: 0;
    }
    li {
        list-style: none;
        width: 296px;
        height: 256px;
        float: left;
        background-color: tomato;
        margin:14px 5px;
    }
    ul {
        margin: 100px auto;
        height: 285px;
        width: 1226px;
        background-color: yellow;
       
    }
    ul .four {
        margin-right: 0;
    }
    
   </style>
</head>
<body>
    <ul>
        <li>1</li>
        <li>2</li>
        <li>3</li>
        <li class="four">4</li>
    </ul>
</body>
</html>